why we need to generate *-jandex.jar ? what is *-jandex.jar used for?

[zhouyaguo]

Hi, all:

My steps:

step1. git clone https://github.com/jbossas/jboss-as.git

step2. vi jboss-as/build/build.xml

     I find the following section:

<module-def name="org.jboss.resteasy.resteasy-atom-provider">

      <maven-resource group="org.jboss.resteasy" artifact="resteasy-atom-provider"  jandex="true"/>

</module-def>

step3. mvn install

step4. After check the target folder "jboss-as-7.1.3.Final/modules/org/jboss/resteasy/resteasy-atom-provider/main", i found a file named resteasy-atom-provider-2.3.3.Final-jandex.jar which contains a binary file named META-INF/jandex.idx

why we need to generate *-jandex.jar ? what is *-jandex.jar used for?

Thanks in advance!

Regards

Yaguo Zhou

[nickarls]

From an article on in.relation.to

One major optimization is that we index annotation information by quickly scanning a subset of the class file data. For even greater efficiency we allow modules the ability to pregenerate a space efficient index which is designed to be loaded very quickly.

[zhouyaguo]

Thanks for ur response, Nicklas.

u mean http://in.relation.to/Bloggers/WhyIsJBossAS7SoFast ? After asking google, i got the link, It's helpful.